If you go to the pom.xml file, there you can see the dependencies for the JDBC, and we are using MySQL for the data. Here is a piece of code of the pom.xml file:

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<!-- This is for JDBC use -->
<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
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<!-- This is for use the MySQL -->
<dependency>
   <groupId>mysql</groupId>
   <artifactId>mysql-connector-java</artifactId>
   <scope>runtime</scope>
</dependency>
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